Are you... are you talking about affinities? I assume so, given you talking about how "Every other stat is included in one of the two all-class backgrounds." If so, then I'd have to guess you haven't updated your game in a really long time, because affinities were removed in
February of 2022. They still stuck around in name, but they no longer mattered mechanically, as from that point onwards we've been able to level up any stat regardless of class, race, and background.
Back when they were still in the game, I found them really annoying and I complained about it too, but it's been gone for well over a year. Why bring it up now?